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According to Euclid, the eye sees objects that are within its visual cone. The visual cone is made up of straight lines, or visual rays, extending outward from the eye. These visual rays are discrete, but we perceive a continuous image because our eyes, and thus our visual rays, move very quickly. [ 7 ]
Graphesthesia is the ability to recognize writing on the skin purely by the sensation of touch. Its name derives from Greek graphē ("writing") and aisthēsis ("perception"). Graphesthesia tests combined cortical sensation; therefore, it is necessary that primary sensation be intact.
Perseus and the Graeae by Edward Burne-Jones (1892). In Greek mythology, the Graeae (/ ˈ ɡ r iː iː /; Ancient Greek: Γραῖαι Graiai, lit. ' old women ', alternatively spelled Graiai), also called the Grey Sisters and the Phorcides (' daughters of Phorcys '), [1] were three sisters who had gray hair from their birth and shared one eye and one tooth among them.
It has been proposed that glass eye covers in hieroglyphs from the Old Kingdom of Egypt (c. 2686–2181 BCE) were functional simple glass meniscus lenses. [40] The so-called Nimrud lens, a rock crystal artifact dated to the 7th century BCE, might have been used as a magnifying glass, although it could have simply been a decoration. [41] [42 ...
Entoptic phenomena (from Ancient Greek ἐντός (entós) 'within' and ὀπτικός (optikós) 'visual'), occasionally and incorrectly referred to as entopic phenomena, are visual effects whose source is within the human eye itself.
Emission theory or extramission theory (variants: extromission) or extromissionism is the proposal that visual perception is accomplished by eye beams emitted by the eyes. This theory has been replaced by intromission theory (or intromissionism ), which is that visual perception comes from something representative of the object (later ...
Epi-LASIK eye surgery: Greek ophthalmologist Ioannis Pallikaris, who was the first person to perform LASIK eye surgery in 1989, [35] developed the improved epi-LASIK technique at the University of Crete. Episteme: is knowledge or understanding. The term epistemology (the branch of philosophy concerning knowledge) is derived from episteme or ...
The main fragment contains the majority of the known mechanism. Clearly visible on the front is the large b1 gear, and under closer inspection further gears behind it (parts of the l, m, c, and d trains are visible as gears to the naked eye). The crank mechanism socket and the side-mounted gear that meshes with b1 is on Fragment A. The back of ...